CN111387972A - Weak current signal acquisition circuit and have this acquisition circuit's seat circle and toilet lid - Google Patents

Weak current signal acquisition circuit and have this acquisition circuit's seat circle and toilet lid Download PDF

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Publication number
CN111387972A
CN111387972A CN202010315692.4A CN202010315692A CN111387972A CN 111387972 A CN111387972 A CN 111387972A CN 202010315692 A CN202010315692 A CN 202010315692A CN 111387972 A CN111387972 A CN 111387972A
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China
Prior art keywords
signal acquisition
operational amplifier
weak current
signal
receiving electrode
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Granted
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CN202010315692.4A
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CN111387972B (en
Inventor
王沛
罗金和
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Guangzhou Yifeng Communication Technology Co.,Ltd.
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Guangzhou Yifeng Health Technology Co ltd
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Priority to CN202010315692.4A priority Critical patent/CN111387972B/en
Publication of CN111387972A publication Critical patent/CN111387972A/en
Priority to PCT/CN2021/083998 priority patent/WO2021213150A1/en
Priority to US17/920,380 priority patent/US20230157611A1/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/316—Modalities, i.e. specific diagnostic methods
    • A61B5/318—Heart-related electrical modalities, e.g. electrocardiography [ECG]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A61B5/305—Common mode rejection
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47K—SANITARY EQUIPMENT NOT OTHERWISE PROVIDED FOR; TOILET ACCESSORIES
    • A47K13/00—Seats or covers for all kinds of closets
    • A47K13/24—Parts or details not covered in, or of interest apart from, groups A47K13/02 - A47K13/22, e.g. devices imparting a swinging or vibrating motion to the seats
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves 
    • A61B5/053—Measuring electrical impedance or conductance of a portion of the body
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/26—Bioelectric electrodes therefor maintaining contact between the body and the electrodes by the action of the subjects, e.g. by placing the body on the electrodes or by grasping the electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
    • A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/25—Bioelectric electrodes therefor
    • A61B5/279—Bioelectric electrodes therefor specially adapted for particular uses
    • A61B5/28—Bioelectric electrodes therefor specially adapted for particular uses for electrocardiography [ECG]
    • A61B5/282—Holders for multiple electrodes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/24—Detecting, measuring or recording bioelectric or biomagnetic signals of the body or parts thereof
    • A61B5/30—Input circuits therefor
    • A61B5/307—Input circuits therefor specially adapted for particular uses
    • A61B5/308—Input circuits therefor specially adapted for particular uses for electrocardiography [ECG]
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
    • A61B5/6887—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient mounted on external non-worn devices, e.g. non-medical devices
    • A61B5/6891—Furniture
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
    • A61B5/7225—Details of analog processing, e.g. isolation amplifier, gain or sensitivity adjustment, filtering, baseline or drift compensation

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Public Health (AREA)
  • Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Medical Informatics (AREA)
  • Molecular Biology (AREA)
  • Biophysics (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Cardiology (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physiology (AREA)
  • Psychiatry (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Radiology & Medical Imaging (AREA)
  • Toilet Supplies (AREA)

Abstract

The invention discloses a weak current signal acquisition circuit, a seat ring and a toilet cover with the weak current signal acquisition circuit, wherein the weak current signal acquisition circuit uses two signal acquisition units as front input electrodes of an amplifying circuit, and adopts an in-phase differential input mode to improve the ratio of the amplitude of a differential mode signal and a common mode signal sent to a rear-stage operational amplifier, thereby achieving the purpose of improving the signal-to-noise ratio of the weak current signal extracted by the signal acquisition units. When people use the toilet lid provided with the weak current signal acquisition circuit, thighs are in contact with the signal acquisition unit arranged on the seat ring, so that the weak current signal acquisition circuit can effectively acquire electrocardiosignals of a human body.

Description

Weak current signal acquisition circuit and have this acquisition circuit's seat circle and toilet lid
Technical Field
The invention relates to the technical field of toilet covers, in particular to a weak current signal acquisition circuit, a seat ring with the weak current signal acquisition circuit and a toilet cover.
Background
The toilet bowl is also called as a closestool, is a necessary appliance in daily life, and the toilet cover with medical and health care functions is more popular. At present, the intelligent toilet cover can collect biological characteristic signals of a human body, such as electrocardiosignals, human body electrical impedance and the like, so as to achieve the purpose of monitoring the health condition of the human body, but in dry winter, the resistance value of the skin surface of a thigh part is very high, so that the electrocardiosignals are difficult to collect through the thigh part, and the collected electrocardiosignals are weak, so that the subsequent processing of the electrocardiosignals is influenced.
Disclosure of Invention
In view of the above, it is desirable to provide a weak current signal acquisition circuit for improving the common mode rejection ratio and the signal-to-noise ratio of the acquired signal, and a toilet lid having the weak current signal acquisition circuit.
The weak current signal acquisition circuit comprises two signal acquisition units, wherein the two signal acquisition units comprise two signal receiving electrode plates and two operational amplifiers, the two operational amplifiers form a differential circuit, and the differential circuit further comprises a first feedback resistor R3A second feedback resistor R3' and a first feedback resistor R3And said second feedback resistance R3' between negative feedback resistor R4(ii) a The negative feedback resistor R4The negative feedback circuit is used for filtering the differential mode signal received by the signal receiving electrode slice.
Further, the two signal receiving electrode slices comprise a first signal receiving electrode slice and a second signal receiving electrode slice, the two operational amplifiers comprise a first operational amplifier A and a second operational amplifier A', and the two signal acquisition units comprise a first signal acquisition unit and a second signal acquisition unit;
the first signal receiving electrode slice and the first operational amplifier A form the first signal acquisition unit, the first signal receiving electrode slice is connected to the equidirectional input end of the first operational amplifier A, and the first feedback resistor R3The first operational amplifier A is arranged between the inverting input end and the inverting output end of the first operational amplifier A;
the second signal receiving electrode slice and the second operational amplifier A 'form the second signal acquisition unit, the second signal receiving electrode slice is connected to the non-inverting input end of the second operational amplifier A', and the second feedback resistorR3'is provided between the inverting input and the output of the second operational amplifier a'.
Further, the two signal receiving electrode slices are active electrode slices, and the two signal receiving electrode slices are used for receiving common-mode signals and differential-mode signals.
Further, the negative feedback circuit is formed by a network component with frequency characteristics and composed of a single resistor or a plurality of electronic elements; alternatively, the negative feedback circuit is formed by network components having all-pass, low-pass, high-pass, band-pass or band-stop frequency characteristics.
And the seat ring is provided with the weak current signal acquisition circuit.
Furthermore, the top ends of the upper surfaces of the left side and the right side of the seat ring are respectively provided with a mounting hole, each mounting hole is internally provided with one signal acquisition unit, the signal receiving electrode sheet is covered at the opening of the mounting hole, and the first operational amplifier A and the second operational amplifier A' are respectively arranged in the two mounting holes.
Furthermore, a wire through hole is respectively arranged in each of the left side edge and the right side edge of the seat ring, one end of each of the two wire through holes is respectively arranged at the bottom of the mounting hole, and the other end of each of the two wire through holes is respectively arranged at the connecting position of the seat ring and the seat cover;
and two signal transmission lines are respectively arranged in the two lead through holes, one ends of the two signal transmission lines are respectively connected to the output ends of the first operational amplifier A and the second operational amplifier A', and the other ends of the two signal transmission lines are respectively connected to a secondary differential amplification circuit.
Further, the signal transmission line adopts a shielded cable.
And, a toilet lid with weak current signal acquisition circuit, including installing as above the seat circle with weak current signal acquisition circuit, the seat circle still includes seat circle adjustment mechanism, seat circle adjustment mechanism locates the bottom surface of seat circle, seat circle adjustment mechanism is used for making the front end of seat circle promotes certain angle.
The beneficial technical effects are as follows:
1. in this patent document, the signal acquisition unit employs active electrode pieces, and two of the active electrode pieces are connected through the negative feedback resistor R4The reverse input ends of the interconnected differential amplifiers can not amplify the differential gain of the common-mode signal, thereby avoiding the common-mode saturation of the circuit and simultaneously improving the common-mode rejection ratio of the whole circuit, thereby improving the signal-to-noise ratio of the system.
2. In this patent document, the current flows through the degeneration resistance R4Is 0, i.e. for common mode signals, the degeneration resistance R is4Corresponding to an open circuit, and thus the degeneration resistance R4Is independent of the common-mode signal, i.e. the degeneration resistance R4Network components having all-pass, low-pass, high-pass, band-pass, or band-stop frequency characteristics may be used instead.
3. In this patent document, the seat circle increases seat circle adjustment mechanism's purpose makes it can adjust the inclination of seat circle makes the human body with signal acquisition unit is inseparabler to further improve the accuracy of the human electrocardiosignal of gathering.
Drawings
Fig. 1 is a first schematic structural diagram of a weak current signal acquisition circuit according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a weak current signal acquisition circuit according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram three of a weak current signal acquisition circuit according to an embodiment of the present invention.
Fig. 4 is a schematic structural view of a seat of a toilet lid having a weak current signal collecting circuit according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram illustrating a first connection method of a signal transmission line in a weak current signal collecting circuit of a toilet lid having the weak current signal collecting circuit according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a second connection method of a signal transmission line in a weak current signal collection circuit of a toilet lid having the weak current signal collection circuit according to an embodiment of the present invention.
FIG. 7 is a schematic structural diagram of a toilet lid and a footrest with weak current signal acquisition circuits according to an embodiment of the present invention.
Detailed Description
The present embodiment takes a weak current signal collecting circuit and a seat ring and a toilet lid having the weak current signal collecting circuit as an example, and the present invention will be described in detail with reference to the following embodiments and accompanying drawings.
Example 1
Referring to fig. 1, fig. 2 and fig. 3, a weak current signal acquisition circuit according to an embodiment of the present invention includes two signal acquisition units, each of the two signal acquisition units includes two signal receiving electrode pads and two operational amplifiers, the two operational amplifiers form a differential circuit, and the differential circuit further includes a first feedback resistor R3A second feedback resistor R3' and a first feedback resistor R3And said second feedback resistance R3' between negative feedback resistor R4。
Further, the two signal receiving electrode pads include a first signal receiving electrode pad 111 and a second signal receiving electrode pad 112, the two operational amplifiers include a first operational amplifier a and a second operational amplifier a', and the two signal acquisition units include a first signal acquisition unit and a second signal acquisition unit;
the first signal receiving electrode pad 111 and the first operational amplifier a constitute the first signal collecting unit, the first signal receiving electrode pad 111 is connected to a homodromous input end of the first operational amplifier a, and the first feedback resistor R3The first operational amplifier A is arranged between the inverting input end and the inverting output end of the first operational amplifier A;
the second signal receiving electrode pad 112 and the second operational amplifier a 'form the second signal collecting unit, the second signal receiving electrode pad 112 is connected to the non-inverting input end of the second operational amplifier a', and the second feedback resistor R3'is provided between the inverting input and the output of the second operational amplifier a'.
Further, the two signal receiving electrode slices are active electrode slices, and the two signal receiving electrode slices are used for receiving common-mode signals and differential-mode signals.
Specifically, referring to fig. 1 and 2, the degeneration resistor R4Is a common resistor for the inverting inputs of the first and second operational amplifiers a and a'.
Two active electrodes simultaneously input common mode signal VcmAt the degeneration resistance R4The potential difference generated at the two ends is 0, and the common mode signal V iscmAt the degeneration resistance R4Common mode current I generated atcm0, forming a differential circuit pair common mode signal V by the first operational amplifier A and the second operational amplifier AcmNo amplification, i.e. common mode gain, is:
Gc＝1
two of the active electrodes input a differential mode signal VdThrough the degeneration resistance R4The differential mode current of (a) is:
Id＝(Vd+-Vd-)/R4
the differential gain is:
Gd＝(2R3+R4)/R4
as can be seen from the above analysis, the inverting input terminals of the first operational amplifier a and the second operational amplifier a' share the degeneration resistor R4The differential gain can be improved without amplifying the common-mode signal, thereby avoiding the common-mode saturation of the circuit and improving the signal-to-noise ratio of the circuit. The common mode rejection ratio of the simultaneous known circuit is CMRR ═ Gd/Gc＝Gd。
Specifically, referring to FIG. 3, the negative feedback resistance R flows through4Of the common-mode current I cm0, which for common mode signals corresponds to an open circuit, and the degeneration resistance R is therefore4Is independent of the common mode signal, the degeneration resistance R4Can be replaced by a network component with frequency characteristics, which is apparent for common-mode signalsThe network component is purely resistive, and the network component has a function of filtering differential mode signals.
Further, the degeneration resistance R4The negative feedback circuit is used for filtering the differential mode signal received by the signal receiving electrode slice.
Further, the negative feedback circuit is formed by a network component with frequency characteristics and composed of a single resistor or a plurality of electronic elements; alternatively, the negative feedback circuit is formed by network components having all-pass, low-pass, high-pass, band-pass or band-stop frequency characteristics.
In this embodiment, the two signal acquisition units are used as the front input electrodes of the amplifying circuit, and an in-phase differential input mode is adopted, so that the ratio of the amplitude of the differential mode signal and the amplitude of the common mode signal sent to the rear-stage operational amplifier is improved, and the purpose of improving the signal-to-noise ratio of the weak current signal extracted by the signal acquisition unit is achieved.
Example 2
Referring to fig. 4, a seat ring 10 having a weak current signal acquisition circuit according to an embodiment of the present invention is shown, where the seat ring 10 is installed with the weak current signal acquisition circuit as described above.
Further, the top ends of the upper surfaces of the left side and the right side of the seat ring 10 are respectively provided with a mounting hole 11, each mounting hole 11 is internally provided with one signal acquisition unit, the signal receiving electrode sheet is covered at the opening of the mounting hole 11, and the first operational amplifier a and the second operational amplifier a' are respectively installed in the two mounting holes 11.
Further, referring to fig. 5 and 6, a wire through hole is respectively disposed in each of the left and right sides of the seat ring 10, one end of each of the two wire through holes is respectively disposed at the bottom of the mounting hole 11, the other end of each of the two wire through holes is respectively disposed at the joint of the seat ring 10 and the seat cover 20, a signal transmission line is respectively disposed in each of the two wire through holes, one end of each of the two signal transmission lines is respectively connected to the output ends of the first operational amplifier a and the second operational amplifier a', and the other end of each of the two signal transmission lines is respectively connected to the secondary differential amplification circuit. The signal transmission line adopts a shielded cable.
Specifically, the seat ring 10 with the weak current signal acquisition circuit installed in the embodiment may be installed on a common toilet lid without heating and flushing functions, or may be installed on an intelligent toilet lid with heating and flushing functions and human body physiological characteristic parameter (such as body fat parameter, body weight parameter, electrocardiograph signal, etc.) detection functions.
Specifically, the first operational amplifier a and the second operational amplifier a ' are preamplifiers, disposed in the seat 10, for collecting electrocardiographic signals of a human body, the second operational amplifier a2 is for amplifying differential signals transmitted from the first operational amplifier a and the second operational amplifier a ', the two amplifier circuits are separated and connected by the signal transmission line, and the negative feedback resistor R4 is replaced by two resistors R4 and R4 ' and disposed in the signal collecting units on the left and right sides of the seat 10.
Specifically, referring to fig. 5, a signal feedback line is respectively disposed in the wire through holes on the left and right sides of the seat ring 10, and the negative feedback resistors R4 and R4 'are connected together by two sections of the shielded cables, that is, the negative feedback circuit is composed of the negative feedback resistors R4 and R4' and two sections of the shielded cables. Referring to fig. 6, in another embodiment, one signal feedback line is used to connect the degeneration resistors R4 and R4 ', i.e., the negative feedback line is composed of the degeneration resistors R4 and R4' and a section of shielded cable.
In the above arrangement, the negative feedback resistors R4 and R4' are connected by one or two shielded cables, so that the reverse input ends of two physically separated operational amplifiers using active electrodes with a distance of more than 10 cm are connected by the shielded cables, thereby reducing the interference of external electrical signals on the signal acquisition unit and improving the accuracy of the system in acquiring human body electrocardio signals.
In this embodiment, the weak current signal acquisition circuit can be applied to any types of toilet covers, and can acquire electrocardiosignals of human legs when people use the toilet, and can effectively extract electrocardiosignals of human bodies even in dry winter.
Example 3
Referring to fig. 7, the present invention further discloses a toilet cover 100 having a weak current signal acquisition circuit, which includes a seat 10 having the weak current signal acquisition circuit and a footrest 30, and further includes a seat adjustment mechanism.
The foot rest board 30 includes pedal support plate 31 and folding connection mechanism 32, folding connection mechanism 32 includes that two are located respectively the coupling assembling of pedal support plate 31 both sides, every coupling assembling's one end connect in the seat circle 10 outside, coupling assembling's the other end is connected to pedal support plate 31.
Further, the seat ring adjusting mechanism is disposed on the bottom surface of the seat ring 10, and when the height of the pedal support plate 31 is increased, the seat ring adjusting mechanism is used to lift the front end of the seat ring 10 by a certain angle.
Specifically, the toilet lid 100 in the present embodiment includes both a general toilet lid 100 without heating and flushing functions and an intelligent toilet lid 100 with heating and flushing functions.
Specifically, the connecting assembly comprises a plurality of connecting arms, and the connecting arms are movably connected to enable the connecting arms to be telescopic or foldable, so that the foot pad 30 can be folded and stored on the toilet seat.
Specifically, the seat ring adjusting mechanism adopts a mechanical linkage device to realize the control of the pedal supporting plate 31 on the lifting angle of the seat ring 10.
In this embodiment, two said connecting assemblies adopt the structure of multi-section connecting arm, make said foot plate 30 can be extended or taken in conveniently, the length of said bearing leg 33 can be adjusted, make the height of said foot plate 30 can be adjusted accordingly, thus change the difference in height between said foot plate 30 and said seat ring 10, facilitate the use of old man and child.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art can make various modifications and changes. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The weak current signal acquisition circuit is characterized by comprising two signal acquisition units, wherein the two signal acquisition units comprise two signal receiving electrode plates and two operational amplifiers, the two operational amplifiers form a differential circuit, and the differential circuit further comprises a first feedback resistor R3A second feedback resistor R3' and a first feedback resistor R3And said second feedback resistance R3' between negative feedback resistor R4(ii) a The negative feedback resistor R4The negative feedback circuit is used for filtering the differential mode signal received by the signal receiving electrode slice.
2. The weak current signal acquisition circuit according to claim 1, wherein the two signal receiving electrode pads comprise a first signal receiving electrode pad and a second signal receiving electrode pad, the two operational amplifiers comprise a first operational amplifier a and a second operational amplifier a', and the two signal acquisition units comprise a first signal acquisition unit and a second signal acquisition unit;
the first signal receiving electrode slice and the first operational amplifier A form the first signal acquisition unit, the first signal receiving electrode slice is connected to the equidirectional input end of the first operational amplifier A, and the first feedback resistor R3The first operational amplifier A is arranged between the inverting input end and the inverting output end of the first operational amplifier A;
the second signal receiving electrode slice and the second operational amplifier A 'form the second signal acquisition unit, the second signal receiving electrode slice is connected to the non-inverting input end of the second operational amplifier A', and the second feedback resistor R3'is provided between the inverting input and the output of the second operational amplifier a'.
3. A weak current signal acquisition circuit as claimed in claim 1, wherein two of said signal receiving electrode pads are active electrode pads, and wherein two of said signal receiving electrode pads are for receiving common mode signals and differential mode signals.
4. The weak current signal acquisition circuit according to claim 1, wherein the negative feedback circuit is formed by a network component having a frequency characteristic and composed of a single resistor or a plurality of electronic elements; alternatively, the negative feedback circuit is formed by network components having all-pass, low-pass, high-pass, band-pass or band-stop frequency characteristics.
5. A seat insert having weak current signal acquisition circuitry, wherein the seat insert is fitted with weak current signal acquisition circuitry as claimed in any one of claims 1 to 4.
6. A seat ring as claimed in claim 5, wherein a mounting hole is formed near the top of the upper surface of each of the left and right sides of the seat ring, a signal collecting unit is disposed in each mounting hole, the signal receiving electrode plate is covered at the opening of the mounting hole, and the first operational amplifier A and the second operational amplifier A' are respectively mounted in the two mounting holes.
7. A seat ring as claimed in claim 6, wherein a wire through hole is formed in each of the left and right sides of the seat ring, one end of each of the two wire through holes is formed at the bottom of the mounting hole, and the other end of each of the two wire through holes is formed at the connection between the seat ring and the seat cover;
and two signal transmission lines are respectively arranged in the two lead through holes, one ends of the two signal transmission lines are respectively connected to the output ends of the first operational amplifier A and the second operational amplifier A', and the other ends of the two signal transmission lines are respectively connected to a secondary differential amplification circuit.
8. A seat insert as claimed in claim 7, wherein the signal transmission line employs shielded cable.
9. A toilet lid with weak current signal acquisition circuit, characterized by comprising a seat ring with weak current signal acquisition circuit according to any one of claims 5-8, and a seat ring adjusting mechanism arranged on the bottom surface of the seat ring and used for lifting the front end of the seat ring by a certain angle.
CN202010315692.4A 2020-04-20 2020-04-20 Weak current signal acquisition circuit and seat ring and toilet cover with same Active CN111387972B (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202010315692.4A CN111387972B (en) 2020-04-20 2020-04-20 Weak current signal acquisition circuit and seat ring and toilet cover with same
PCT/CN2021/083998 WO2021213150A1 (en) 2020-04-20 2021-03-30 Weak current signal acquisition circuit, and seat and seat cover having same
US17/920,380 US20230157611A1 (en) 2020-04-20 2021-03-30 Weak current signal acquisition circuit, and seat and seat cover having same

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Application Number Priority Date Filing Date Title
CN202010315692.4A CN111387972B (en) 2020-04-20 2020-04-20 Weak current signal acquisition circuit and seat ring and toilet cover with same

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CN111387972A true CN111387972A (en) 2020-07-10
CN111387972B CN111387972B (en) 2023-10-31

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CN (1) CN111387972B (en)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021213150A1 (en) * 2020-04-20 2021-10-28 广州易风健康科技股份有限公司 Weak current signal acquisition circuit, and seat and seat cover having same
WO2022236468A1 (en) * 2021-05-08 2022-11-17 深圳技术大学 Active electrode circuit for acquisition of weak electrical signal

Citations (41)

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